CN220850397U - Injection molded bearing retainer for electric drive - Google Patents

Abstract

The utility model belongs to the technical field of bearings, and particularly provides an injection molded bearing retainer for electric drive, wherein a plurality of pockets are formed in the retainer along the circumferential direction, the pockets penetrate through the retainer along the radial direction, window beams are formed between adjacent pockets, the retainer comprises an inner ring and an outer ring, the retainer is provided with a first end and a second end along the axial direction, the window beams of the inner ring are provided with a plurality of first oil grooves at the first end, and the window beams of the outer ring are provided with a plurality of second oil grooves at the second end; the first oil groove penetrates through the inner ring along the radial direction, and the second oil groove penetrates through the outer ring; along the axial direction, the first oil groove and the second oil groove are partially overlapped in structure and partially enclosed to form an oil hole which is communicated with the inner ring surface and the outer ring surface of the retainer. The retainer comprises the inner ring and the outer ring, the first oil groove and the second oil groove can be combined into the oil hole, and the arrangement mode can realize the effects of reducing the weight of the retainer and facilitating the flow of oil by utilizing the combined structure of the first oil groove and the second oil groove under the condition that the rotation balance of the retainer is ensured.

Description

Injection molded bearing retainer for electric drive

Technical Field

The application belongs to the technical field of bearings, and particularly provides an injection molded bearing retainer for electric drive.

Background

The ball bearing cage is generally of an annular structure, and a plurality of pockets penetrating the cage in the radial direction are provided in the circumferential direction of the bearing cage, and balls are accommodated in the pockets. In the field of electric drive, the ball bearing has the characteristic of high rotating speed during operation, and the ball bearing rotating at high speed can lead to severe friction between the retainer and the balls, so that the retainer is easy to deform under the conditions of friction heating or bearing larger external force, and in the friction process, the harshness noise is generated.

The inventor has attempted in prior chinese patent application CN202321917297.9 to provide the cage as an integrally formed inner and outer ring which are nested axially and have a partial structural overlap. The inner ring and the outer ring are respectively provided with a first semicircular groove and a second semicircular groove, and the first semicircular groove and the second semicircular groove enclose to form a pocket. However, under the condition that the retainer adopts the combination of the inner ring and the outer ring, the window beam parts between the adjacent pockets are not designed to be light, and lubricating oil can only flow between the inner ring and the outer ring of the retainer through the pockets, so that the flow efficiency of the retainer is not convenient to further improve.

In addition, in the prior application, only partial structures of the inner ring and the outer ring are overlapped in the axial direction of the retainer, although the thickness of the retainer is larger only in the overlapped part of the structures, so that the requirements of light weight and structural strength are balanced. However, the retainer has uneven axial mass distribution, and stress concentration is easy to occur at the abrupt position of radial thickness, so that the retainer is easy to break at the abrupt position of size.

Disclosure of utility model

The utility model aims to provide an injection molded bearing retainer for electric drive, which solves at least one of the technical problems.

In order to solve the above-mentioned problems in the prior art, one or more embodiments of the present utility model provide an injection molded bearing cage for electric drive, the cage being provided with a plurality of pockets in a circumferential direction, the pockets penetrating the cage in a radial direction, window beams being formed between adjacent pockets, the cage including an inner ring and an outer ring, the cage having a first end and a second end in an axial direction, the window beams of the inner ring having a plurality of first oil grooves at the first end, the window beams of the outer ring having a plurality of second oil grooves at the second end, the second oil grooves being opposite to the first oil grooves; the first oil groove penetrates through the inner ring along the radial direction, and the second oil groove penetrates through the outer ring; along the axial direction, the first oil groove and the second oil groove are partially overlapped in structure and partially enclosed to form an oil hole which is communicated with the inner ring surface and the outer ring surface of the retainer.

The beneficial effects of one or more of the technical schemes are as follows:

In this scheme, the holder comprises inner ring and outer loop, forms the window roof beam between the adjacent pocket hole, and the window roof beam is in the first oil groove opening of inner ring part and window roof beam in the second oil groove opening opposite direction of outer loop part to first oil groove and second oil groove have partial structure overlap and the part of overlapping enclose and form the oilhole. Firstly, the arrangement mode can form the oil hole at the window beam of the retainer, the oil hole can communicate the inner ring and the outer ring of the retainer, and further the uniformity of distribution of lubricating oil liquid in the inner ring and the outer ring of the retainer is improved, so that the lubricating oil liquid is fully filled between the retainer and the balls, friction between the retainer and the balls is reduced, and the probability of noise generation is reduced.

In this scheme, first oil groove and second oil groove are equivalent to the opening and run through the first end of inner ring and the second end of outer loop respectively, and the effect of subtracting heavy can be realized to the part that first oil groove and second oil groove did not overlap, is convenient for realize the lightweight design of holder. In addition, the first oil groove is convenient for communicating the first end of the inner ring with the oil hole through the groove which can be axially guided, and similarly, the second end of the outer ring is communicated with the oil hole through the groove; the structure is convenient for realizing axial flow guiding of the lubricating oil on the inner ring surface and the outer ring surface of the retainer, and improves the uniformity of the lubricating oil distribution.

Drawings

Some embodiments of the application are described below with reference to the accompanying drawings, in which:

FIG. 1 is an isometric view of an overall structure in an embodiment of the utility model;

FIG. 2 is a schematic bottom view of the overall structure of an embodiment of the present utility model;

FIG. 3 is a schematic top view of the overall structure of an embodiment of the present utility model;

FIG. 4 is a schematic axial view of an outer ring structure according to an embodiment of the present utility model;

FIG. 5 is a schematic front view of an outer ring structure according to an embodiment of the present utility model;

FIG. 6 is a schematic illustration of an isometric view of an inner ring in an example embodiment of the utility model;

FIG. 7 is a schematic front view of an inner ring in accordance with an embodiment of the utility model;

FIG. 8 is a cross-sectional view of the overall structure in an embodiment of the utility model;

fig. 9 is an enlarged schematic view of the portion a of fig. 8.

In the figure, 1, an outer ring; 101. a second oil groove; 102. a second semicircular groove; 103. a second window beam portion; 104. a second inclined surface; 105. a second groove; 2. an inner ring; 201. a first oil groove; 202. a first semicircular groove; 203. a first window beam portion; 204. a first inclined surface; 205. a first groove; 3. a pocket; 1021. an annulus; 1022. a curved surface.

Detailed Description

It should be understood by those skilled in the art that the embodiments described below are only preferred embodiments of the present application, and do not represent that the present application can be realized only by the preferred embodiments, which are merely for explaining the technical principles of the present application, not for limiting the scope of the present application. All other embodiments, which can be obtained by a person skilled in the art without any inventive effort, based on the preferred embodiments provided by the present application, shall still fall within the scope of protection of the present application.

It should be noted that, in the description of the present application, terms such as "center", "upper", "lower", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate directions or positional relationships, which are based on the directions or positional relationships shown in the drawings, are merely for convenience of description, and do not indicate or imply that devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 9, an exemplary embodiment of the present application provides an injection molded bearing cage for electric drive, the cage being provided with a plurality of pockets 3 along a circumferential direction, the pockets 3 penetrating the cage in a radial direction, window beams being formed between adjacent pockets 3 (i.e., a first window beam portion 103 at an inner ring 2 and a second window beam portion 203 at an outer ring 1 in the drawings), the cage including an inner ring 2 and an outer ring 1, the cage having a first end and a second end along an axial direction, the window beams of the inner ring 2 having a plurality of first oil grooves 201 at the first end, the window beams of the outer ring 1 having a plurality of second oil grooves 101 at the second end; radially, the first oil groove 201 penetrates the inner ring 2, and the second oil groove 101 penetrates the outer ring 1; in the axial direction, the first oil groove 201 and the second oil groove 101 have partially overlapped structures and the overlapped portions enclose oil holes that communicate the inner ring surface and the outer ring surface of the retainer.

In this embodiment, the cage is manufactured by injection molding, and the material of the cage may be PA46 material (polybutylene adipamide) or PEEK material (polyetheretherketone). I.e. the inner ring 2 and the outer ring 1 of the cage are of an integrally formed structure, and the division of the cage into the inner ring 2 and the outer ring 1 is merely for convenience of description.

The above mentioned window beam of the outer ring 1 has a plurality of second oil grooves 101 at the second end, being opposite to the first oil grooves 201, it should be understood that: the first oil groove 201 and the second oil groove 101 have centroids, the surfaces of the centroids passing through the central axis of the retainer are two reference surfaces, and the two reference surfaces at the first oil groove 201 and the second oil groove 101 are overlapped.

The above mentioned cage comprises an inner ring 2 and an outer ring 1, i.e. the inner ring 2 is nested coaxially in the outer ring 1. The two cases are included, wherein the first case is that only part of structures of the inner ring 2 and the outer ring 1 are overlapped along the axial direction, and at the moment, the two ends of the retainer along the axial direction are thinner, and the middle part is thicker; at this time, it is convenient to balance the influence of the thickness and the structural strength of the retainer, but a problem of stress concentration is easily formed at the thickness abrupt change. The second case is that the inner ring 2 and the outer ring 1 are completely overlapped in the axial direction, that is, the lengths of the inner ring 2 and the outer ring 1 in the axial direction are the same and the end surfaces of the inner ring 2 and the outer ring 1 are flush.

The first oil groove 201 is provided at the first end of the inner ring 2 and extends toward the second end, and the second oil groove 101 is provided at the second end of the outer ring 1 and extends toward the first end. In order to achieve symmetry of the first oil groove 201 and the second oil groove 101 along the axial direction of the cage, the first oil groove 201 extends from the first end to the second end by a distance D1, and the second oil groove 101 extends from the second end to the first end by a distance D2, d1=d2.

The first oil groove 201 is mentioned as extending radially through the inner ring 2, and the second oil groove 101 is mentioned as extending radially through the outer ring 1. It is understood that the larger the widths of the first oil groove 201 and the second oil groove 101 in the circumferential direction of the cage, the smoother the passage of the lubricating oil can be allowed, but the structural strength of the cage is reduced. To solve this problem, in the present embodiment, the opening of the first oil groove 201 becomes gradually smaller and the opening of the first oil groove 201 becomes gradually larger in a direction approaching the center of the cage in the radial direction. At this time, the cross-sectional dimensions of the first oil groove 201 opening and the inner ring surface cross-sectional dimension of the cage and the cross-sectional dimensions of the second oil groove 101 opening and the outer ring surface cross-sectional dimension of the cage are larger, so that the lubricating oil can be conveniently introduced into the oil holes, and the material removal amount of the first oil groove 201 and the second oil groove 101 at the whole cage can be reduced, so that the structural strength of the cage at the window beam is not excessively weakened.

Specifically, in order to achieve the above-described purpose of approaching the center of the cage in the radial direction, the opening of the first oil groove 201 becomes gradually smaller, and the opening of the first oil groove 201 becomes gradually larger: in this embodiment, two first inclined surfaces 204 are provided on both sides of the first oil groove 201 in the circumferential direction, and the distance between the two first inclined surfaces 204 becomes smaller gradually in the direction away from the center of the cage. The second oil groove 101 has two second inclined surfaces 104 on both sides in the circumferential direction, and the distance between the two second inclined surfaces 104 becomes gradually larger in the direction away from the center of the cage.

Specifically, the first inclined surface 204 and the second inclined surface 104 are planar, and in other embodiments, the first inclined surface 204 and the second inclined surface 104 may be cambered structures. Further, arc chamfer angles are arranged between the first inclined surface 204 and the inner wall surface of the inner ring 2 and between the second inclined surface 104 and the outer wall surface of the outer ring 1. The arc chamfer can reduce sharp corners in the retainer, so that the probability of producing scraps by damage at the sharp corners is reduced.

Specifically, the first oil groove 201 and the second oil groove 101 are square grooves, and the first oil groove 201 is exemplified as a square groove having a cross-sectional profile along the radial direction of the treatment inner ring 2 (i.e., tangential direction of the inner ring 2).

The above-mentioned structural arrangement of the inner ring 2 and the outer ring 1 at the window beam shows that when the pocket 3 penetrating the inner ring 2 and the outer ring 1 is directly formed at the retainer, the thickness of the pocket 3 along the radial direction of the retainer is equal to the sum of the wall thicknesses of the inner ring 2 and the outer ring 1. At this time, the area of the inner wall surface of the pocket 3 is large, the friction area between the pocket and the ball is large, and the problem of excessive friction and heat generation is easily caused.

To solve this problem, the inner ring 2 in this embodiment has a plurality of first grooves penetrating the inner ring 2 in the radial direction at a first end, and the outer ring 1 has a plurality of second grooves penetrating the outer ring 1 in the radial direction at a second end; the first groove body comprises a first groove 205 and a first semicircular groove 202 which are sequentially arranged from a first end to a second end, the second groove body comprises a second groove 105 and a second semicircular groove 102 which are sequentially arranged from the second end to the first end, and the width of the first groove 205 and the second groove 105 along the circumferential direction of the retainer is not smaller than the diameters of the first semicircular groove 202 and the second semicircular groove 102; the first semicircular groove 202 and the second semicircular groove 102 are circular in projection along the radial direction of the retainer and enclose the synthetic pocket 3.

When the first groove body is composed of the first groove 205 and the first semicircular groove 202, and the second groove body is composed of the second groove 105 and the second semicircular groove 102, the first groove 205 and the second groove 105 can be far away from the pocket 3 without affecting the loading of balls at the retainer; meanwhile, the widths of the first groove 205 and the second groove 105 are equal to the diameters of the first semicircular groove 202 and the second semicircular groove 102, at this time, the inner walls of the first groove 205 and the second groove 105 do not participate in forming the pocket 3, so that the area of the inner wall surface of the pocket 3 can be effectively controlled, the excessive area of the inner wall surface caused by increasing the thickness of the middle part of the retainer is avoided, and the friction force between the retainer and the balls is reduced.

Specifically, the inner wall surface of the second semicircular groove 102 includes a ring surface 1021 and a curved surface 1022 which are connected, a generatrix of the ring surface 1021 is a straight line, the curved surface 1022 is a curve at present, a maximum distance of the curve from the axis of the second semicircular groove 102 is H1, and a distance of the ring surface 1021 from the axis of the second semicircular groove 102 is H2, wherein h1=h2. At this time, when the balls are loaded into the cage from the outside of the cage, the balls mainly contact the curved surface 1022 in the second semicircular groove 102, and the annular surface 1021 restricts the balls from being released from the second semicircular groove 102 to the outside of the cage. In addition, the annular surface 1021 is convenient for guiding the lubricating oil to the position between the curved surface 1022 and the balls in the pocket 3, so that the balls are sufficiently lubricated by the lubricating oil, and the friction resistance of the balls and the balls is reduced.

Thus far, the technical solution of the present application has been described in connection with the foregoing preferred embodiments, but it will be readily understood by those skilled in the art that the scope of the present application is not limited to the above-described preferred embodiments. The technical solutions in the above preferred embodiments can be split and combined by those skilled in the art without departing from the technical principles of the present application, and equivalent changes or substitutions can be made to related technical features, so any changes, equivalent substitutions, improvements, etc. made within the technical principles and/or technical concepts of the present application will fall within the protection scope of the present application.

Claims (8)

1. Injection molding's bearing holder for electric drive, the holder is equipped with a plurality of pockets along circumference, the pocket radially runs through the holder, forms the window roof beam between the adjacent pocket, the holder includes inner ring and outer loop, its characterized in that: the retainer is provided with a first end and a second end along the axial direction, the window beams of the inner ring are provided with a plurality of first oil grooves at the first end, and the window beams of the outer ring are provided with a plurality of second oil grooves right opposite to the first oil grooves at the second end; the first oil groove penetrates through the inner ring along the radial direction, and the second oil groove penetrates through the outer ring; along the axial direction, the first oil groove and the second oil groove are partially overlapped in structure and partially enclosed to form an oil hole which is communicated with the inner ring surface and the outer ring surface of the retainer.

2. The injection molded bearing retainer for electric drive according to claim 1, wherein the first oil groove extends from the first end to the second end by a distance D1, the second oil groove extends from the second end to the first end by a distance D2, and d1=d2.

3. The injection molded bearing retainer for electric drive according to claim 1, wherein the opening of the first oil groove becomes smaller and the opening of the first oil groove becomes larger in a direction approaching a center of the retainer in a radial direction.

4. An injection molded bearing cage for electric drive according to claim 3 wherein the first oil groove has two first inclined surfaces on both sides in the circumferential direction, the distance between the two first inclined surfaces becoming smaller in a direction away from the center of the cage.

5. An injection molded bearing cage for electric drive according to claim 3 wherein the second oil groove has two second inclined surfaces on both sides in the circumferential direction, the distance between the two second inclined surfaces being gradually increased in a direction away from the center of the cage.

6. An injection molded bearing retainer for electric drive according to claim 1, wherein the inner and outer rings are identical in length in the axial direction and are flush in end faces.

7. The injection molded bearing retainer for an electric drive of claim 1, wherein the inner ring has a plurality of first grooves extending radially through the inner ring at a first end and the outer ring has a plurality of second grooves extending radially through the outer ring at a second end;

The first groove body comprises a first groove and a first semicircular groove which are sequentially arranged from a first end to a second end, the second groove comprises a second groove and a second semicircular groove which are sequentially arranged from the second end to the first end, and the width of the first groove and the second groove along the circumferential direction of the retainer is not smaller than the diameters of the first semicircular groove and the second semicircular groove; the projections of the first semicircular groove and the second semicircular groove along the radial direction of the retainer are circular and enclose to form the pocket.

8. The injection molded bearing retainer for an electric drive of claim 7, wherein the inner wall surface of the second half groove comprises a connected annulus and a curved surface, a generatrix of the annulus being a straight line, the curved surface being a curve, the curve having a maximum distance H1 from the axis of the second half groove, the annulus having a distance H2 from the axis of the second half groove, wherein h1=h2.